(1) an exclamation or reaction of inarticulate despair, preferably with a good dose of being overfamiliar and bored with the situation thrown in. The verbal equivalent of scratching your fingernails down a blackboard. Best uttered by two or more people at once.

(2) (vb) to do something impressively badly, preferably when there is an audience to witness and berate you for how badly you did it.

"Oh Mr Darcy, you do make one blush," said Elizabeth as he stared intensely yet longingly into her eyes.
"I love you, Miss Eliza. From the very moment I saw you, I was assured that I had found the woman of my dreams. I love you from the depths of my soul, and always will. Now take that dress off so that I can lick the scrange from your twat, you dirty fucking bint."